<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // for (let i = 1; i <= 5; i++) {
    //   for (let j = 1; j <= i; j++) {
    //     document.write(' * ')
    //   }
    //   document.write('<br>')
    // }


    let h = prompt('请输入行数:')
    let l = prompt('请输入列数:')
    for (let i = 1; i <= h; i++) {
      for (let j = 1; j <= l; j++) {
        document.write(' * ')
      }
      document.write('<br>')
    }
  </script>
</body>

</html>